Landing weights on commercial aircraft are often in the 400,000 lb range or above... Takeoff weights often exceed 750,000 lbs... add to the landing weight load, all factors such as side loads [ie cross wind loads] and landing speeds nearing 200 mph, so the tires at touch down are NOT turning, then suddenly have landing loads plus speed and acceleration loads... the amount of loading force at the bearing point of internal contact requires a high degree of precision and material integrity..
Smaller, non commercial use aircraft, have lighter loads, but still make wheel contact at close to 100 mph [in the case of light twin engine aircraft... same requirements... just not quite as severe... All loading in the aircraft use is potentially in ways an auto would never see... On Fri, Aug 31, 2018 at 3:22 PM, Mitch Haley via Mercedes < mercedes@okiebenz.com> wrote: > > > On August 31, 2018 at 5:55 PM Craig via Mercedes <mercedes@okiebenz.com> > wrote: > > > > High rated bearings are intended for precision applications like aircraft > > instruments or surgical equipment. > > > > *** Lower graded bearings are intended for the vast majority > > of applications such as vehicles, mechanical hobbies, > > skates, skateboards, fishing reels and industrial machinery. *** > > > > High ABEC rated bearings allow optimal performance of critical > > applications requiring very high RPM and smooth operation. > > I can't imagine where in a car, or an aircraft outside of a turbine engine > or gyroscope, a ABEC 9 (Class 2) bearing would be noticeably smoother than > a ABEC 7. > > Mitch. > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
